[Bug tree-optimization/86492] [8/9 Regression] store-merging wrong-code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86492

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44385
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44385&action=edit
gcc9-pr86492.patch

Untested fix.